"According to modern cosmological theory, based on Einstein's General Relativity (our modern theory of gravity), the big bang did not occur somewhere in space; it occupied the whole of space. Indeed, it created space. Distant galaxies are not traveling at a high speed through space; instead, just like our own galaxy, they are moving relatively slowly with respect to any of their neighboring galaxies. It is the expansion of space, between the time when the stars in these distant galaxies emitted light and our telescopes receive it, that causes the wavelength of the light to lengthen (redshift). Space is itself infinitely elastic; it is not expanding into anything."
Likely a better explanation, and one that I still consider. But his interpretation casts much doubt, and if the vacuum inflated, so did the impedance of space or the gravitational constant. We cannot have it both ways, the vacuum expanded buts its properties were unaffected? Impossible. He once again assumes a structure for the vacuum with no method to define that structure.
The idea that the vacuum bubble expanded is a bit far fetched, they most likely just changed their relative shapes, thus changing the dimensionality of symmetry. But topological considerations make even that circumspect.
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